Malicious PDF — malware analysis report

Static analysis result for SHA-256 8eab9de3372824f4…

MALICIOUS

PDF

86.0 KB Created: 2021-09-23 21:05:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 9dce256847d52c482fa4b8bf8a729407 SHA-1: 89bdcfbb24fafe373649f8c90e7f8bfb8cf8c9f7 SHA-256: 8eab9de3372824f4b192c8de2bfdd4e22ae7f0a376c0d781b6277eaea53a6222
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file contains embedded JavaScript and a significant number of external URIs, many of which are part of a link farm hosted on disposable or compromised domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript, while not fully analyzed due to obfuscation, is a common vector for exploitation in PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://laborke.ru/uplcv?utm_term=tap+forms+alternative+android PDF link annotation
    • http://g-shocktou.com/user_file/file/12201457556.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/16132fe9eb8f97---97819625783.pdfIn PDF document text
    • https://stayinbranson.com/ckfinder/triplebuserfiles/file/linew.pdfIn PDF document text
    • https://iieng.org/editor/ckfinder/userfiles/files/33583061154.pdfIn PDF document text
    • https://lanhcongnghiepthinhphat.com/upload/files/muxafapewi.pdfIn PDF document text
    • https://satybharat.com/ci/userfiles/files/vuzepajijubisapomutunena.pdfIn PDF document text
    • http://bielwod.com/userfiles/file/sodutopadumofiberejijuma.pdfIn PDF document text
    • http://taixingchem.com/uploadfile/file/20210916114923682.pdfIn PDF document text
    • https://pensiunea-escape.ro/ckfinder/userfiles/files/66849582063.pdfIn PDF document text
    • https://baruipur.org/ckfinder/userfiles/files/92855566138.pdfIn PDF document text
    • http://lachambredechos.com/userfiles/file/woxobawakipozosiluw.pdfIn PDF document text
    • http://ccsup.co.th/uploads/ckfinder/files/suvoz.pdfIn PDF document text
    • https://gedayapi.com/userfiles/file/tamojurozi.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d0f014deee---79843616868.pdfIn PDF document text
    • http://thuephotocopytaihanoi.com/upload/files/86772858649.pdfIn PDF document text
    • http://intproplaw.com/admin/uploads/file/zutosovorepopekowomefip.pdfIn PDF document text
    • http://parateam.cz/file/dibujesurixivasapelodovo.pdfIn PDF document text
    • https://alienaquatics.com/home/gb/public_html/ckfinder/userfiles/files/14319016256.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16134f02a1923d---63743352505.pdfIn PDF document text
    • https://www.shamshabaddiocese.org/files/js/ckfinder/userfiles/files/58368332359.pdfIn PDF document text
    • https://leganordavigliana.it/uploads/file/36145282215.pdfIn PDF document text
    • https://narellesastro.com/userfiles/files/36055369868.pdfIn PDF document text
    • https://geniodelweb.com/file/24085963691.pdfIn PDF document text
    • http://tcyy88.com/userfiles/file/2021090901020173499.pdfIn PDF document text
    • https://sskundal.com/userfiles/file/sawowexewo.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA36 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010248.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10248 18512 bytes
SHA-256: a62e9e4fb61e5fff11b7c49eee81449d8f1dae02bd911bcdbb668a00b60b689c
font_02_sfnt_off0001326f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1326F 10688 bytes
SHA-256: 7805a53e6bd579679a445e8f737ff7d8444c4e7244388c818b139e56dfe72052

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